Dear Fluent Users.

I am a Brazilian student and I started a PhD at Aston University - UK this year. I intend to use Fluent to simulate a Downdraft Biomass Gasification Process, but I am new in CFD's World and I need some advice. Then, I will appreciate if anyone give me some advice.

My best Wishes.

Antonio Oliveira

What aspects are you working on? The built in models of Fluent probably are fine if you are interested in flows, temperatures, etc. If you need to do more detailed chemistry of gasification you will need to implement your own code. Writing UDFs can be time consuming - allow several weeks or months for each.

Thanks.

I am interested in study the species and temperature profiles. I am interested in the pressure drop across the bed too. I think that I will need to write UDF's. What do you suggest?

On the pressure drop, you probably want to consider porous cells, although this approach is more of a parametric analysis. The porous cells can give reasonable agreement with measured pressure losses but don't give much information about packing density or influence of gasification rates, etc. You may wish to consider a two-phase fluid approach, but this is a major project.

Will you have experimental data on which to base your reaction rates? If not, I would suggest that writing UDFs for the reactions would not be worth it.

Good luck.

Dear Allan Walsh,

Thanks for your help. I will star the activities and follow your advice.

Best wishes.

Antonio Oliveira

[wanglong]

Originally Posted by Allan Walsh
;146012

On the pressure drop, you probably want to consider porous cells, although this approach is more of a parametric analysis. The porous cells can give reasonable agreement with measured pressure losses but don't give much information about packing density or influence of gasification rates, etc. You may wish to consider a two-phase fluid approach, but this is a major project.

Will you have experimental data on which to base your reaction rates? If not, I would suggest that writing UDFs for the reactions would not be worth it.

Good luck.

Dear Allan
I also tried to build a biomass gasification model use Fluent6.3
Could you talk about how to set two phase reactions?
It is fixed bed, how to set biomass particles as fixed and slowly drop down in the gasification process?
Thank you!

Wang